-83.71% is the change from 663 to 108
Calculation steps:
[( 108 - 663 ) ÷ 663] x 100 = -83.71%
Formula
Percentage change = [(108 - 663) / 663] x 100
Subtract the new number by the original number
108 - 663 = -555
-555 ÷ 663 = -0.8371040723981901
-0.8371040723981901 x 100 = -83.71%